Hello all! Nice forum!

I´m working on a robot lawnmover, have som problems with the buried wire fence. Found one simple circuit with a 555 as driver but I can´t understand how they use the TDA2003 as amplifier, actually I´m not sure that it is a TDA2003 used?? It just says 2003 (but 16 pin??)

Can anyone please understand this?

here is the pdf of the wirefence
http://www.robotshop.se/micro/pdf/rob_sch1.pdf

Best regards
wretan

 

Hello,

I think they use the ULN2003, A multiple buffer.

Greetings,
Bertus

 

Hello,

I think they use the ULN2003, A multiple buffer.

Greetings,
Bertus

Hi bertus and thank you for the reply!
I have searched the web and can´t find what a multiple buffer does (in this application) ?

I´m a n00bie into digital circuits but it someway seemed resonable to have some kind of amplifier to get the signal high enough to get through a big garden

Thanks once again!
/wretan

 

Hello,

Here is the datasheet.
It consists of 7 darlington transistors on a DIL housing.

Greetings,
Bertus